• Rock Paper Scissors Lizard Spock Game Java Code
• Rock Paper Scissors Game Online
• Rock Paper Scissors Java Code
• Simple Javascript Rock Paper Scissors Game
• Rock Paper Scissors Game Variations

Steps of the Rock Paper Scissors Java Program We will create a class Player.java that represents the user who is going to play the game with the computer. The class Computer.java represents the Computer that is playing with the user. Driver.java is a helper class containing the Rock Paper Scissor constant variables and the business logic code. The “Rock, Paper and Scissors” is a classic game that can be used as an excuse to grasp the basics of a programming language (C in this tutorial). To execute multiple rounds of the game, a swift flow of control is required.

I'm new to programming and I'm trying to write a very simple Rock, Paper, Scissors game in Java. It will compile and run fine, but I am looking to say something like 'Invalid move. Try again.' or something along those lines for when the user (personPlay) does not enter a correct character (r, p, or s). What would be the best way to do so? For example, if you enter a 'q', it should print 'Invalid move.' Thank you so much in advance!

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skaffman

closed as too broad by davidism, skaffman, Radiodef, WilQu, GenericJonMar 30 '15 at 12:37

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5 Answers

I would recommend making Rock, Paper and Scissors objects. The objects would have the logic of both translating to/from Strings and also 'knowing' what beats what. The Java enum is perfect for this.

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The parseType method can return null if the String is not a valid type. And you code can check if the value is null and if so, print 'invalid try again' and loop back to re-read the Scanner.

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Furthermore, your type enum can determine what beats what by having each Type object know:

Rock Paper Scissors Lizard Spock Game Java Code

each type will implement this method differently to see what beats what:

Then in your code

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Rock Paper Scissors Game Online

Before we try to solve the invalid character problem, the lack of curly braces around the if and else if statements is wreaking havoc on your program's logic. Change it to this:

Much clearer! It's now actually a piece of cake to catch the bad characters. You need to move the else statement to somewhere that will catch the errors before you attempt to process anything else. So change everything to:

Rock Paper Scissors Java Code

musical_codermusical_coder

Why not check for what the user entered and then ask the user to enter correct input again?

eg:

for the other modifications, please check my total code at pastebin

Simple Javascript Rock Paper Scissors Game

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Rock Paper Scissors Game Variations

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